CONSTANT RESISTANCE NETWORKS 



191 



Fig. 7— A three-filter constant resistance combination. 



LOW 

 PASS 



HIGH 

 PASS 



I 



LOW 

 PASS 



n 



HIGH 

 PASS 



HI 



LOW 

 PASS 



r-J in 



HIGH 

 PASS 



rr 



LOW 

 PASS 



n 



HIGH 

 PASS 



m 



LOW 

 PASS 



n 



HIGH 

 PASS 



n 



LOW 

 PASS 



r 



HIGH 



PASS 



I 



10 15 20 25 30 



FREQUENCY IN KILOCYCLES PER SECOND 



Fig. 8 — Constant resistance networks used as directional filters. 



